CN105186634A - Charging circuit and mobile terminal - Google Patents
Charging circuit and mobile terminal Download PDFInfo
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- CN105186634A CN105186634A CN201510705938.8A CN201510705938A CN105186634A CN 105186634 A CN105186634 A CN 105186634A CN 201510705938 A CN201510705938 A CN 201510705938A CN 105186634 A CN105186634 A CN 105186634A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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Abstract
The invention provides a charging circuit and a mobile terminal, relates to the electronic field, and solves problems that when a lithium battery is normally charged in a low-temperature environment, the circulation life of the battery can be reduced in the prior art, and an existing solving scheme is not suitable for the mobile terminal. The charging circuit comprises a detection module, a first charging module and a second charging module, wherein the detection module is used for detecting the temperature of the battery; the first charging module is used for charging the battery by using first current when the temperature of the battery is more than or equal to a preset value; the second charging module is used for charging the battery by using second current when the temperature of the battery is less than the preset value; the first current is less than the second current. The scheme disclosed by the invention can be used for effectively solving the problem that the lithium battery and the like can not be normally charged in the low-temperature environment, and the charging circuit can be used for ensuring the battery charging efficiency and the battery circulation life, and can be effectively suitable for portable mobile terminal application environments.
Description
Technical field
The present invention relates to electronic applications, particularly a kind of charging circuit and mobile terminal.
Background technology
Lithium ion battery has the advantages such as energy density is high, memory-less effect, is widely used in every field.But because some characteristics of lithium ion battery limit, user is required stricter when charging to the mobile terminal with lithium ion battery.Especially at low ambient temperatures, the activity of lithium ion is very low, if adopt the charging current (as 0.5C charges) same with under normal temperature, easily form lithium metal at negative pole graphite deposits, the cycle life of battery is reduced, and expansion rate also can increase.Therefore, for ensureing the cycle life of battery, needing during charging at low ambient temperatures to reduce charging current, but the increase of charge completion time can be brought again after reducing charging current.
The method of current solution lithium battery low temperature charging is generally and increases heater at outside batteries, after detecting that ambient temperature does not meet the requirement of lithium cell charging, just starts external heating device to heating of battery, after battery temperature raises, restarts charging.Although this mode can solve the problem of lithium battery low temperature charging to a certain extent, but this mode is not suitable for being applied to mobile terminal, main cause is that mobile terminal belongs to portable product, increases the volume that heater can increase mobile terminal, affects outward appearance.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of charging circuit and mobile terminal, solve lithium battery in prior art and adopt normal charging current to reduce battery cycle life at low ambient temperatures, and current solution is not suitable for the problem of mobile terminal.
For solving the problems of the technologies described above, embodiments of the invention provide a kind of charging circuit, and described charging circuit comprises:
Detection module, for detecting the temperature of battery;
First charging module, for when the temperature of described battery is more than or equal to a preset value, adopts the first electric current to charge to described battery;
Second charging module, for when the temperature of described battery is less than described preset value, adopt the second electric current to charge to described battery, described first electric current is less than described second electric current;
Wherein, described first charging module comprises the first integrated circuit be connected between described detection module and described battery, described first charging module when the temperature of described battery is more than or equal to described preset value, adopts described first electric current to charge to described battery by described first integrated circuit; The second integrated circuit that described second charging module comprises described first integrated circuit and is connected with described first integrated circuit, wherein said second integrated circuit is provided with heating element, described second charging module by described first integrated circuit and described second integrated circuit composition circuit when the temperature of described battery is less than described preset value, adopt described second electric current to charge to described battery; Or
Described first charging module comprises the 3rd integrated circuit be connected between described detection module and described battery, described first charging module when the temperature of described battery is more than or equal to described preset value, adopts described first electric current to charge to described battery by described 3rd integrated circuit; Described second charging module comprises the 4th integrated circuit be connected between described detection module and described battery, described second charging module when the temperature of described battery is less than described preset value, adopts described second electric current to charge to described battery by described 4th integrated circuit.
For solving the problems of the technologies described above, embodiments of the invention also provide a kind of mobile terminal, comprising: charging circuit as above.
The beneficial effect of technique scheme of the present invention is as follows:
The charging circuit of the embodiment of the present invention, first detects the temperature of battery by detection module; Then, when the temperature of battery is more than or equal to a preset value, the first current versus cell is adopted to charge by the first charging module; When the temperature of battery is less than this preset value, the second current versus cell is adopted to charge by the second charging module; Wherein, the first electric current is less than the second electric current.This charging circuit adopts high yield heat pattern to charge to battery at low ambient temperatures, the temperature of battery can be increased, reach to make battery temperature and charge normal requirement, efficiently solve the problem as lithium battery etc. can not charge normal at low ambient temperatures, ensure that battery charge efficiency and battery cycle life; And this charging circuit effectively can be applicable to portable terminal applies environment, can not increase terminal volume, also can not affect outward appearance, improve practicality.
Accompanying drawing explanation
Fig. 1 is the structure chart of charging circuit first embodiment of the present invention;
Fig. 2 is the structure chart of charging circuit first embodiment of the present invention;
Fig. 3 is the structure chart of charging circuit second embodiment of the present invention;
Fig. 4 is the structure chart of charging circuit second embodiment specific implementation of the present invention;
Fig. 5 is the workflow diagram of structure shown in Fig. 4;
Fig. 6 is the structure chart of charging circuit of the present invention 3rd embodiment;
Fig. 7 is the structure chart of charging circuit of the present invention 3rd embodiment specific implementation;
Fig. 8 is the workflow diagram of structure shown in Fig. 7;
Fig. 9 is the structure chart of charging circuit of the present invention 4th embodiment;
Figure 10 is the structure chart of charging circuit of the present invention 4th embodiment.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The charging circuit of the embodiment of the present invention and mobile terminal, do not increase terminal volume, do not affect outward appearance prerequisite under, efficiently solve battery at low ambient temperatures charging can reduce the problem of cycle life, ensure that charge efficiency and the useful life of battery, there is very high promotional value and practical value.
First embodiment
Refer to Fig. 1-2, it illustrates the structure chart of the charging circuit that first embodiment of the invention provides, this charging circuit can comprise:
Detection module 101, for detecting the temperature of battery.
Here, detected the temperature of battery by detection module 101, the conversion carrying out charge mode for the follow-up temperature according to battery provides Data support.
First charging module 102, for when the temperature of described battery is more than or equal to a preset value, adopts the first electric current to charge to described battery 104.
Here, when the temperature of battery is more than or equal to a preset value, adopts the first current versus cell 104 to charge, can ensure the charge efficiency of battery 104 by the first charging module 102, wherein, this preset value is the threshold value of the battery temperature charging normal requirement.
Second charging module 103, for when the temperature of described battery is less than described preset value, adopt the second electric current to charge to described battery 104, described first electric current is less than described second electric current.
Here, the first electric current is less than the second electric current, makes within the unit interval, the charging process of the second charging module 103 produce the charging process that heat energy is greater than the first charging module 102 and produce heat energy.
Wherein, described first charging module 102 comprises the first integrated circuit 105 be connected between described detection module 101 and described battery 104, described first charging module 102 when the temperature of described battery is more than or equal to described preset value, adopts described first electric current to charge to described battery 104 by described first integrated circuit 105; The second integrated circuit 106 that described second charging module 103 comprises described first integrated circuit 105 and is connected with described first integrated circuit 105, wherein said second integrated circuit 106 is provided with heating element, described second charging module 103 by described first integrated circuit 105 and described second integrated circuit 106 form circuit when the temperature of described battery is less than described preset value, adopt described second electric current to charge to described battery 104; Or
Described first charging module 102 comprises the 3rd integrated circuit 107 be connected between described detection module 101 and described battery 104, described first charging module 102 when the temperature of described battery is more than or equal to described preset value, adopts described first electric current to charge to described battery 104 by described 3rd integrated circuit 107; Described second charging module 103 comprises the 4th integrated circuit 108 be connected between described detection module 101 and described battery 104, described second charging module 103 when the temperature of described battery is less than described preset value, adopts described second electric current to charge to described battery 104 by described 4th integrated circuit 108.
Here, by increasing heating element on the second integrated circuit 106, reduce the charge efficiency of the second charging module 103, or use four integrated circuit 108 more than the 3rd integrated circuit 107 heat production, the charging current of the first charging module 102 (the first electric current) is made to be less than the charging current (the second electric current) of the second charging module 103, thus within the unit interval, the charging process of the second charging module 103 produce the charging process that heat energy is greater than the first charging module 102 and produce heat energy.
Therefore, when the temperature of battery is less than this preset value, the second current versus cell 104 is adopted to charge by the second charging module 103, heat production can be increased, improve battery temperature, reach to make battery temperature and charge normal requirement, charging under avoiding low temperature environment affects the problem of battery cycle life, thus improves the useful life of battery 104.
Concrete, heat conduction charging module produced by heat pipe, PGS (PyrolyticGraphiteSheet, graphite heat radiation fin) etc. to battery, to improve battery temperature.
Preferably, described detection module 101 can comprise the thermistor be arranged on described battery 104.This thermistor is arranged at the NTC (NegativeTemperatureCoefficient, negative tempperature coefficient thermistor) of battery 104 inside as can be.
Now, the temperature of battery 104 accurately can be detected by the thermistor be arranged on battery 104, the selection carrying out charge mode for the follow-up temperature according to battery 104 provides strong Data support.
To sum up, the charging circuit of the embodiment of the present invention, first detects the temperature of battery by detection module 101; Then, when the temperature of battery is more than or equal to a preset value, the first current versus cell 104 is adopted to charge by the first charging module 102; When the temperature of battery is less than this preset value, the second current versus cell 104 is adopted to charge by the second charging module 103; Wherein, the first electric current is less than the second electric current, makes within the unit interval, the charging process of the second charging module 103 produce the charging process that heat energy is greater than the first charging module 102 and produce heat energy.This charging circuit adopts high yield heat pattern to charge to battery at low ambient temperatures, the temperature of battery can be increased, reach to make battery temperature and charge normal requirement, efficiently solve the problem as lithium battery etc. can not charge normal at low ambient temperatures, ensure that battery charge efficiency and battery cycle life; And this charging circuit effectively can be applicable to portable terminal applies environment, can not increase terminal volume, also can not affect outward appearance, improve practicality.
Second embodiment
Refer to Fig. 3, it illustrates the structure chart of the charging circuit that second embodiment of the invention provides, this charging circuit can comprise:
Detection module 301, for detecting the temperature of battery.
Here, detected the temperature of battery by detection module 301, the conversion carrying out charge mode for the follow-up temperature according to battery provides Data support.
First charging module 302, for when the temperature of battery is more than or equal to a preset value, adopts the first electric current to charge to described battery 304.Concrete, described first charging module 302 comprises the first integrated circuit 305 be connected between described detection module 301 and described battery 304.Preferably, described first integrated circuit 305 comprises the first DC-DC DC-DC charge integrated circuit 307.
Here, because a DC-DC charge integrated circuit 307 adopts switched charge pattern in normal operation, there is higher charge efficiency, therefore when the temperature of battery is more than or equal to a preset value, the first current versus cell 304 is adopted to charge by a DC-DC charge integrated circuit 307, can ensure the charge efficiency of battery 304, wherein, this preset value is the threshold value of the battery temperature charging normal requirement.
Second charging module 303, for when the temperature of described battery is less than described preset value, charges to described battery 304.Concrete, the second integrated circuit 306 that described second charging module 303 comprises described first integrated circuit 305 and is connected with described first integrated circuit 305, wherein said second integrated circuit 306 is provided with heating element.Preferably, described second integrated circuit 306 is connected between a described DC-DC charge integrated circuit 307 and described battery 304, or one end of described second integrated circuit 306 is connected with a described DC-DC charge integrated circuit 307, other end ground connection.The connected mode of the second integrated circuit 306 and a DC-DC charge integrated circuit 307 can set according to demand.
Wherein, because the second charging module 303 adds heating element on the basis of the first charging module 302, reduce the charge efficiency of a DC-DC charge integrated circuit 307 of the second charging module 303, therefore the first electric current is less than the second electric current, make within the unit interval, the charging process of the second charging module 303 produce the charging process that heat energy is greater than the first charging module 302 and produce heat energy.
Here, when the temperature of battery is less than this preset value, the circuit combined by a DC-DC charge integrated circuit 307 and the second integrated circuit 306 is charged to battery 304, heat production can be increased, improve battery temperature, reach to make battery temperature and charge normal requirement, charging under avoiding low temperature environment affects the problem of battery cycle life, thus improves the useful life of battery 304.
Preferably, described second integrated circuit 306 is also provided with the control switch be connected with described heating element, and when the temperature of described battery is less than described preset value, described control switch is opened.
Now, the heating element of the second integrated circuit is connected with the first charge integrated circuit by this control switch.When the temperature of battery is less than preset value, control switch is opened, and heating element access the one DC-DC charge integrated circuit, effectively reduces the charge efficiency of a DC-DC charge integrated circuit, add the quantity of heat production of a DC-DC charge integrated circuit.
Further, described control switch comprises a metal oxide semiconductor field effect transistor MOSFET and manages; Described heating element comprises one and adds thermal capacitance.
Now, when battery temperature is less than preset value, MOSFET pipe is opened, electric heating access the one DC-DC charge integrated circuit will be added, effectively reduce the charge efficiency of a DC-DC charge integrated circuit, increase charging current, thus add the quantity of heat production of a DC-DC charge integrated circuit.
To sum up, the charging circuit of the embodiment of the present invention, first detects the temperature of battery by detection module 301; Then when the temperature of battery is more than or equal to a preset value, by a DC-DC charge integrated circuit 307 of the first charging module 302, the first current versus cell 304 is adopted to charge; When the temperature of battery is less than this preset value, the circuit combined by a DC-DC charge integrated circuit 307 and second integrated circuit 306 of the second charging module 303, adopts the second current versus cell to charge; Wherein, because the second charging module 303 adds heating element on the basis of the first charging module 302, therefore the first electric current is less than the second electric current, make within the unit interval, the charging process of the second charging module 303 produce the charging process that heat energy is greater than the first charging module 302 and produce heat energy.This charging circuit adopts high yield heat pattern to charge to battery at low ambient temperatures, the temperature of battery can be increased, reach to make battery temperature and charge normal requirement, efficiently solve the problem as lithium battery etc. can not charge normal at low ambient temperatures, ensure that battery charge efficiency and battery cycle life; And this charging circuit effectively can be applicable to portable terminal applies environment, can not increase terminal volume, also can not affect outward appearance, improve practicality.
Refer to Fig. 4, it illustrates the structure chart of the charging circuit specific implementation that second embodiment of the invention provides, this charging circuit comprises DC-DC charging IC (IintegratedCircuit, integrated circuit) be connected between detection module and battery.VBUS (VoltageBUS, the voltage bus) pin of the one DC-DC charging IC and input power V
inconnect.At input power V
inand a DC-DC charges between IC and is connected with an input capacitance C
iN, this input capacitance C
iNone end and this input power V
inconnect, other end ground connection.SW (Switch, the switch) pin of the one DC-DC charging IC is by an outputting inductance L
owith the cathode voltage V of power brick PACK
bATconnect.At outputting inductance L
oand be also connected with an output capacitance C between battery
o1, this output capacitance C
o1one end and this outputting inductance L
oconnect, other end ground connection.This input capacitance C
iN, the one DC-DC charge IC, outputting inductance L
oand output capacitance C
o1constitute the first integrated circuit.At a DC-DC charging IC and this outputting inductance L
obetween be also connected with a MOSFET pipe Q1 and and add thermal capacitance C
a, this adds thermal capacitance C
aone end be connected with MOSFET pipe Q1, other end ground connection, this MOSFET pipe Q1 and add thermal capacitance C
aconstitute the second integrated circuit.
Refer to Fig. 5, it illustrates the workflow diagram of the structure shown in Fig. 4, comprising:
Step 501, charger inserts.
In this step, after charger inserts, charging circuit access power supply, controls correlation module and opens.
Step 502, detection module detects the temperature of battery.
In this step, after charging circuit access power supply, control the temperature that detection module detects battery.
Step 503, judges whether the temperature of battery is more than or equal to preset value.
In this step, by judging whether the temperature of battery is more than or equal to preset value, can judge whether battery place ambient temperature meets the temperature charging normal requirement, with the problem being avoided low temperature charging to produce by subsequent step.
Step 504, when the judged result of above-mentioned steps 503 is for being, when namely the temperature of battery is more than or equal to preset value, closes MOSFET pipe Q1, until charging complete.
In this step, if the temperature of battery is more than or equal to preset value, then close MOSFET pipe Q1, make a DC-DC charge IC by the first integrated circuit, adopt the first current versus cell to charge, ensure that the charge efficiency of a DC-DC charging IC.
Step 505, when the judged result of above-mentioned steps 503 is no, when namely the temperature of battery is less than preset value, opens MOSFET pipe Q1.
In this step, if the temperature of battery is less than preset value, then opens MOSFET pipe Q1, will thermal capacitance C be added
aaccess a DC-DC charging IC, the circuit that a DC-DC charging IC is consisted of the first integrated circuit and the second integrated circuit charges to battery.For the switched charge pattern of a DC-DC charging IC, add thermal capacitance C
aadd the switching loss of a DC-DC charging IC, reduce the charge efficiency of a DC-DC charging IC, increase charging current, thus add the caloric value of a DC-DC charging IC.
By heat pipe, PGS (PyrolyticGraphiteSheet, graphite heat radiation fin) etc. by the one DC-DC charge IC produce heat conduction to battery, to improve the temperature of battery.Normal mode charging is adopted to affect the problem of battery cycle life on battery under effectively prevent low temperature environment.
Step 506, continues to judge whether the temperature of battery is more than or equal to preset value, and when judged result is no, returns step 505.
In this step, by continuing to judge whether the temperature of battery is more than or equal to preset value, can battery temperature satisfied charge normal require time, in time charge mode is switched to normal charge mode, to ensure charge efficiency.
Step 507, when above-mentioned steps 506 judged result is for being, closes MOSFET pipe Q1, until charging complete.
In this step, battery temperature meet charge normal require time, in time charge mode is switched to normal charge mode, improves charge efficiency.
Step 508, terminates.
As can be seen from the above analysis, the charging circuit of the application embodiment of the present invention, do not increase terminal volume, do not affect outward appearance prerequisite under, efficiently solve as lithium battery etc. at low ambient temperatures charging can reduce cycle life and the conditional problem of charging current, ensure that charge efficiency and the useful life of battery, there is very high promotional value and practical value.
3rd embodiment
Refer to Fig. 6, it illustrates the structure chart of the charging circuit that third embodiment of the invention provides, this charging circuit can comprise:
Detection module 601, for detecting the temperature of battery.
Here, detected the temperature of battery by detection module 601, the conversion carrying out charge mode for the follow-up temperature according to battery provides Data support.
First charging module 602, for when the temperature of described battery is more than or equal to a preset value, adopts the first electric current to charge to described battery 604.Concrete, described first charging module 602 comprises the 3rd integrated circuit 605 be connected between described detection module 601 and described battery 604.Preferably, described 3rd integrated circuit 605 comprises the second DC-DC DC-DC charge integrated circuit 607.
Here, when the temperature of battery is more than or equal to a preset value, by the 2nd DC-DC charge integrated circuit 607 of the first charging module 602, the first current versus cell 604 is adopted to charge, the charge efficiency of battery 204 can be ensured, wherein, this preset value is the threshold value of the battery temperature charging normal requirement.
Second charging module 603, for when the temperature of described battery is less than described preset value, adopts the second electric current to charge to described battery 604.Concrete, described second charging module 603 comprises the 4th integrated circuit 606 be connected between described detection module 601 and described battery 604.Preferably, described 4th integrated circuit 606 comprises linear-charging integrated circuit 608.
Wherein, switched charge pattern is adopted compared to the 2nd DC-DC charge integrated circuit 607, linear-charging integrated circuit 608 adopts linear charge mode more easily to produce heat, therefore the first electric current is less than the second electric current, make within the unit interval, the charging process of the second charging module 603 produce the charging process that heat energy is greater than the first charging module 602 and produce heat energy.
Here, when the temperature of battery is less than this preset value, by the linear-charging integrated circuit 608 of the second charging module 603, the second current versus cell 604 is adopted to charge, can heat production be increased, improve battery temperature, reach to make battery temperature and charge normal requirement, charge under avoiding low temperature environment and affect the problem of battery cycle life, thus improve the useful life of battery 604.
To sum up, the charging circuit of the embodiment of the present invention, first detects the temperature of battery by detection module 601; Then when the temperature of battery is more than or equal to a preset value, by the 2nd DC-DC charge integrated circuit 607 of the first charging module 602, the first current versus cell 604 is adopted to charge; When the temperature of battery is less than this preset value, by the linear-charging integrated circuit 605 of the second charging module 603, the second current versus cell 604 is adopted to charge; Wherein, because linear-charging integrated circuit is compared to the easier heat production of DC-DC charge integrated circuit, therefore the first electric current is less than the second electric current, makes within the unit interval, the charging process of the second charging module 603 produce the charging process that heat energy is greater than the first charging module 602 and produce heat energy.This charging circuit adopts high yield heat pattern to charge to battery at low ambient temperatures, the temperature of battery can be increased, reach to make battery temperature and charge normal requirement, efficiently solve the problem as lithium battery etc. can not charge normal at low ambient temperatures, ensure that battery charge efficiency and battery cycle life; And this charging circuit effectively can be applicable to portable terminal applies environment, can not increase terminal volume, also can not affect outward appearance, improve practicality.
Refer to Fig. 7, it illustrates the structure chart of the charging circuit specific implementation that third embodiment of the invention provides, this charging circuit comprises the 2nd DC-DC charging IC and linear-charging IC be connected between detection module and battery.2nd DC-DC charge the VBUS pin of IC and this linear-charging IC VBUS pin respectively with input power V
inconnect.At input power V
inand two are charged between IC and are connected with an input capacitance C
iN, this input capacitance C
iNone end and this input power V
inconnect, other end ground connection.The SW pin of the 2nd DC-DC charging IC is by an outputting inductance L
owith the cathode voltage V of power brick PACK
bATconnect, at outputting inductance L
oand be also connected with an output capacitance C between battery
o1, this output capacitance C
o1one end and this outputting inductance L
oconnect, other end ground connection.This input capacitance C
iN, the 2nd DC-DC charge IC, outputting inductance L
oand output capacitance C
o1constitute the 3rd integrated circuit.The voltage of this linear-charging IC export VOUT pin also with the cathode voltage V of power brick PACK
bATconnect, this input capacitance C
iNthe 4th integrated circuit is constituted with linear-charging IC.
Refer to Fig. 8, it illustrates the workflow diagram of the structure shown in Fig. 7, comprising:
Step 801, charger inserts.
In this step, after charger inserts, charging circuit access power supply, controls correlation module and opens.
Step 802, detection module detects the temperature of battery.
In this step, after charging circuit access power supply, control the temperature that detection module detects battery.
Step 803, judges whether the temperature of battery is more than or equal to preset value.
In this step, by judging whether the temperature of battery is more than or equal to preset value, can judge whether battery place ambient temperature meets the temperature charging normal requirement, with the problem being avoided low temperature charging to produce by subsequent step.
Step 804, when the judged result of above-mentioned steps 803 is for being, when namely the temperature of battery being more than or equal to preset value, starting the 2nd DC-DC charging IC and adopting the first current versus cell to charge, until charging complete.
In this step, if the temperature of battery is more than or equal to preset value, then adopts the first current versus cell to charge by the 2nd DC-DC charging IC, ensure that battery charge efficiency.
Step 805, when the judged result of above-mentioned steps 803 is no, when namely the temperature of battery is less than preset value, starts linear-charging IC and adopts the second current versus cell to charge.
In this step, if the temperature of battery is less than preset value, then by linear-charging IC, battery is charged, increase charging current, thus add the quantity of heat production of charging IC.
Heat conduction linear-charging IC produced by heat pipe, PGS (PyrolyticGraphiteSheet, graphite heat radiation fin) etc. to battery, to improve the temperature of battery.Normal mode charging is adopted to affect the problem of battery cycle life on battery under effectively prevent low temperature environment.
Step 806, continues to judge whether the temperature of battery is more than or equal to preset value, and when judged result is no, returns step 805.
In this step, by continuing to judge whether the temperature of battery is more than or equal to preset value, can battery temperature satisfied charge normal require time, in time charge mode is switched to normal charge mode, to ensure charge efficiency.
Step 807, when above-mentioned steps 806 judged result is for being, is switched to the 2nd DC-DC charging IC and charges to battery, until charging complete.
In this step, battery temperature meet charge normal require time, in time charge mode is switched to normal charge mode, improves charge efficiency.
Step 808, terminates.
As can be seen from the above analysis, the charging circuit of the application embodiment of the present invention, do not increase terminal volume, do not affect outward appearance prerequisite under, efficiently solve as lithium battery etc. at low ambient temperatures charging can reduce cycle life and the conditional problem of charging current, ensure that charge efficiency and the useful life of battery, there is very high promotional value and practical value.
4th embodiment
Refer to Fig. 9-10, it illustrates the structure chart of the charging circuit that fourth embodiment of the invention provides, this charging circuit can comprise:
Detection module 901, for detecting the temperature of battery.
Here, detected the temperature of battery by detection module 901, the conversion carrying out charge mode for the follow-up temperature according to battery provides Data support.
First charging module 902, for when the temperature of described battery is more than or equal to a preset value, adopts the first electric current to charge to described battery 904.
Here, when the temperature of battery is more than or equal to a preset value, adopts the first current versus cell 904 to charge, can ensure the charge efficiency of battery 904 by the first charging module 902, wherein, this preset value is the threshold value of the battery temperature charging normal requirement.
Second charging module 903, for when the temperature of described battery is less than described preset value, adopt the second electric current to charge to described battery 904, described first electric current is less than described second electric current.
Here, the first electric current is less than the second electric current, makes within the unit interval, the charging process of the second charging module 903 produce the charging process that heat energy is greater than the first charging module 902 and produce heat energy.
Wherein, described first charging module 902 comprises the first integrated circuit 905 be connected between described detection module 901 and described battery 904, described first charging module 902 when the temperature of described battery is more than or equal to described preset value, adopts described first electric current to charge to described battery 904 by described first integrated circuit 905; The second integrated circuit 906 that described second charging module 903 comprises described first integrated circuit 905 and is connected with described first integrated circuit 905, wherein said second integrated circuit 906 is provided with heating element, described second charging module 903 by described first integrated circuit 905 and described second integrated circuit 906 form circuit when the temperature of described battery is less than described preset value, adopt described second electric current to charge to described battery 904; Or
Described first charging module 902 comprises the 3rd integrated circuit 907 be connected between described detection module 901 and described battery 904, described first charging module 902 when the temperature of described battery is more than or equal to described preset value, adopts described first electric current to charge to described battery 904 by described 3rd integrated circuit 907; Described second charging module 903 comprises the 4th integrated circuit 908 be connected between described detection module 901 and described battery 904, described second charging module 903 when the temperature of described battery is less than described preset value, adopts described second electric current to charge to described battery 904 by described 4th integrated circuit 908.
Here, by increasing heating element on the second integrated circuit 906, reduce the charge efficiency of the second charging module 903, or use four integrated circuit 908 more than the 3rd integrated circuit 907 heat production, the charging current of the first charging module 902 (the first electric current) is made to be less than the charging current (the second electric current) of the second charging module 903, thus within the unit interval, the charging process of the second charging module 903 produce the charging process that heat energy is greater than the first charging module 902 and produce heat energy.
Therefore, when the temperature of battery is less than this preset value, the second current versus cell 904 is adopted to charge by the second charging module 903, heat production can be increased, improve battery temperature, reach to make battery temperature and charge normal requirement, charging under avoiding low temperature environment affects the problem of battery cycle life, thus improves the useful life of battery 904.
The heavily loaded module 909 be connected with described detection module 901 and predetermined peripheral unit 910 respectively, for when the temperature of described battery is less than described preset value, controls described predetermined peripheral unit 910 and enters heavy duty work pattern.
Preferably, described predetermined peripheral unit 910 comprises one or more in central processor CPU, Power Management Unit and backlight integrated circuit.
Now, when the temperature of battery is less than preset value, entering heavy duty work pattern by controlling the predetermined peripheral units 910 such as central processor CPU, Power Management Unit PMU and backlight IC, further increasing terminal quantity of heat production, thus further increasing the temperature of battery 904.
To sum up, the charging circuit of the embodiment of the present invention, first detects the temperature of battery by detection module 901; Then, when the temperature of battery is more than or equal to a preset value, the first current versus cell 904 is adopted to charge by the first charging module 902; When the temperature of battery is less than this preset value, adopt the second current versus cell 904 to charge by the second charging module 903, and control predetermined peripheral unit 910 by heavily loaded module 909 and enter heavy duty work pattern, increase the quantity of heat production of predetermined peripheral unit 910; Wherein, the first electric current is less than the second electric current, makes within the unit interval, the charging process of the second charging module 903 produce the charging process that heat energy is greater than the first charging module 902 and produce heat energy.This charging circuit adopts high yield heat pattern to charge to battery at low ambient temperatures, and increase the quantity of heat production of predetermined peripheral unit, the temperature of battery can be improved, reach to make battery temperature and charge normal requirement, efficiently solve the problem as lithium battery etc. can not charge normal at low ambient temperatures, ensure that battery charge efficiency and battery cycle life; And this charging circuit effectively can be applicable to portable terminal applies environment, can not increase terminal volume, also can not affect outward appearance, improve practicality.
Because the charging circuit of the embodiment of the present invention is applied to mobile terminal, therefore, the embodiment of the present invention additionally provides a kind of mobile terminal, comprising: the charging circuit as described in above-described embodiment.Wherein, the described embodiment that realizes of above-mentioned charging circuit is all applicable in the embodiment of this mobile terminal, also can reach identical technique effect.
Mobile terminal of the present invention is as being the various mobile electronic devices such as mobile phone, panel computer, PC, notebook.
Preferably, described mobile terminal can also comprise:
Be arranged at described charging circuit outside, and the thermal conduction module contacted with described battery, for the thermal energy conduction that produced by described charging circuit to described battery.
Preferably, described thermal conduction module can comprise heat pipe and graphite heat radiation fin PGS, and it is outside that described heat pipe is arranged at described charging circuit, and contacted with described battery by described PGS.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (11)
1. a charging circuit, is characterized in that, described charging circuit comprises:
Detection module, for detecting the temperature of battery;
First charging module, for when the temperature of described battery is more than or equal to a preset value, adopts the first electric current to charge to described battery;
Second charging module, for when the temperature of described battery is less than described preset value, adopt the second electric current to charge to described battery, described first electric current is less than described second electric current;
Wherein, described first charging module comprises the first integrated circuit be connected between described detection module and described battery, described first charging module when the temperature of described battery is more than or equal to described preset value, adopts described first electric current to charge to described battery by described first integrated circuit; The second integrated circuit that described second charging module comprises described first integrated circuit and is connected with described first integrated circuit, wherein said second integrated circuit is provided with heating element, described second charging module by described first integrated circuit and described second integrated circuit composition circuit when the temperature of described battery is less than described preset value, adopt described second electric current to charge to described battery; Or
Described first charging module comprises the 3rd integrated circuit be connected between described detection module and described battery, described first charging module when the temperature of described battery is more than or equal to described preset value, adopts described first electric current to charge to described battery by described 3rd integrated circuit; Described second charging module comprises the 4th integrated circuit be connected between described detection module and described battery, described second charging module when the temperature of described battery is less than described preset value, adopts described second electric current to charge to described battery by described 4th integrated circuit.
2. charging circuit according to claim 1, it is characterized in that, described first integrated circuit comprises the first DC-DC DC-DC charge integrated circuit, described second integrated circuit is connected between a described DC-DC charge integrated circuit and described battery, or one end of described second integrated circuit is connected with a described DC-DC charge integrated circuit, other end ground connection.
3. charging circuit according to claim 2, is characterized in that, described second integrated circuit is also provided with the control switch be connected with described heating element, and when the temperature of described battery is less than described preset value, described control switch is opened.
4. charging circuit according to claim 3, is characterized in that, described control switch comprises a metal oxide semiconductor field effect transistor MOSFET and manages; Described heating element comprises one and adds thermal capacitance.
5. charging circuit according to claim 1, is characterized in that, described 3rd integrated circuit comprises the 2nd DC-DC charge integrated circuit; Described 4th integrated circuit comprises linear-charging integrated circuit.
6. charging circuit according to claim 1, is characterized in that, described charging circuit also comprises:
The heavily loaded module be connected with described detection module and predetermined peripheral unit respectively, for when the temperature of described battery is less than described preset value, controls described predetermined peripheral unit and enters heavy duty work pattern.
7. charging circuit according to claim 6, is characterized in that, described predetermined peripheral unit comprises one or more in central processor CPU, Power Management Unit and backlight integrated circuit.
8. charging circuit according to claim 1, is characterized in that, described detection module comprises the thermistor be arranged on described battery.
9. a mobile terminal, is characterized in that, comprising: the charging circuit as described in any one of claim 1-8.
10. mobile terminal according to claim 9, is characterized in that, described mobile terminal also comprises:
Be arranged at described charging circuit outside, and the thermal conduction module contacted with described battery, for the thermal energy conduction that produced by described charging circuit to described battery.
11. mobile terminals according to claim 10, is characterized in that, described thermal conduction module comprises heat pipe and graphite heat radiation fin PGS, and it is outside that described heat pipe is arranged at described charging circuit, and contacted with described battery by described PGS.
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| CN201510705938.8A CN105186634B (en) | 2015-10-26 | 2015-10-26 | A kind of charging circuit and mobile terminal |
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| CN201510705938.8A CN105186634B (en) | 2015-10-26 | 2015-10-26 | A kind of charging circuit and mobile terminal |
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| CN105186634B (en) | 2017-11-28 |
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